Drrawdog1

How can I stop the trunk rattling in my trunk? I just installed a aftermarket 10 inch sub in SC300.

Tammy

But, the nature of the beast is low frequency vibration

Empty the trunk of excess. Pack everything left in foam.

Turn down the ten inch aftermarket speaker..

Drrawdog1

What type of Foam? And When you say turn down speaker do you mean the Amp?

vin 78

Expanding foam? If Tammy is talking about expanding foam, be VERY careful with it, since it can get out of hand and warp sheet metal.
Sound damping the rear deck would help control the rattles, and a layer/sheet of 1/4-3/8" foam would help too (maybe that's what Tammy's referring to?). Dynamat makes some effective products, check out:this and this , I'm using the tac mat and it works well in addition to the 2 layers of dynamat.
Also, check your rear 3rd brake light, rear area of the headliner and quarter panels.

cliffud

iTrader: (3)

i'd suggest taking out your rear deck just under the back window to see if you can apply some dynamat there. that's most likely the culprit since you said you JUST swapped out your sub.